七牛跨域上传设置了returnUrl和returnBody，返回的HTTP 代码是303，但被浏览器cancel掉了，why？

PutPolicy putPolicy = new PutPolicy(bucketName);

    putPolicy.returnUrl = "http://192.168.1.53:8085/video/videoCallBack.htm";

putPolicy.returnBody = "{\"name\": $(fname),\"size\": \"$(fsize)\",\"key\": $(key), \"hash\": $(etag),\"mimeType\": $(mimeType)}";

    String uptoken = putPolicy.token(mac);
    return uptoken;
}

去七牛上看过，文件上传是成功了的。

用chrome://net-internals 查看了下请求的信息

t=36694 [st=36623] -HTTP_TRANSACTION_SEND_REQUEST
t=36694 [st=36623] +HTTP_TRANSACTION_READ_HEADERS [dt=742]
t=36694 [st=36623] HTTP_STREAM_PARSER_READ_HEADERS [dt=742]
t=37436 [st=37365] HTTP_TRANSACTION_READ_RESPONSE_HEADERS

                      --> HTTP/1.1 303 See Other
                          Server: nginx/1.4.4
                          Date: Fri, 10 Apr 2015 01:11:47 GMT
                          Content-Type: text/plain; charset=utf-8
                          **Content-Length: 0**
                          Connection: keep-alive
                          Access-Control-Allow-Headers: X-File-Name, X-File-Type, X-File-Size
                          Access-Control-Allow-Methods: OPTIONS, HEAD, POST
                          Access-Control-Allow-Origin: *
                          Access-Control-Max-Age: 2592000
                          Cache-Control: no-store, no-cache, must-revalidate
                          **Location: http://XXXXXXX:14600/video/videoCallBack.htm?upload_ret=eyJuYW1lIjogIkplbGx5ZmlzaC5qcGciLCJzaXplIjogIjc3NTcwMiIsImtleSI6ICIxNDI4NjI3NDMwODY4IiwgImhhc2giOiAiRmpzVnZvU3Y4Z3N5S3BQQXVhcW1MaVd0TTdTMCIsIm1pbWVUeXBlIjogImltYWdlL2pwZWcifQ==**
                          Pragma: no-cache
                          X-Content-Type-Options: nosniff
                          X-Log: s.ph;s.put.tw:1;s.put.tr:11;s.put.tw:5;s.put.tr:8;s.ph;s.put.tw:1;s.put.tr:10;s.ph;PFDS:20;PFDS:21;PFDS:21;rs12_8.sel/not found;rs11_8.sel/not found;rdb.g/no such key;DBD/404;DBG/404;v4.sel:1/Document not found;rs12_8.ins;qtbl.ins:3;mc.s;RS:5;rs.put:5;rs-upload.putFile:29;UP:47/303
                          X-Reqid: NyIAAIiAuXLggdMT

t=37436 [st=37365] -HTTP_TRANSACTION_READ_HEADERS
t=37436 [st=37365] URL_REQUEST_DELEGATE [dt=0]
t=37436 [st=37365] +URL_REQUEST_DELEGATE [dt=31]
t=37436 [st=37365] DELEGATE_INFO [dt=31]

                      --> delegate_info = "AsyncResourceHandler"

t=37467 [st=37396] -URL_REQUEST_DELEGATE
t=37467 [st=37396] CANCELLED
t=37468 [st=37397] -URL_REQUEST_START_JOB

                  **--> net_error = -3 (ERR_ABORTED)**

t=37468 [st=37397] URL_REQUEST_DELEGATE [dt=0]
t=37468 [st=37397] -REQUEST_ALIVE

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后来有人解释说是因为flash升级的原因，改用其它的处理方法。

http://.com/q/1010000002619532?_ea=169806

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回调地址要是一个公网IP,且要有返回数据。